Somewhat relevant to Indian passport holders since instead of being totally useless if you live in India, you can now combine your entry into the US with getting enrolled into the program.
Per the US CBP:
Starting today, you have the unique opportunity to interview for Global Entry when you return from your next international trip at Houston, Hobby, Austin, San Francisco, and Vancouver.
What is Enrollment on Arrival? With Enrollment on Arrival, Global Entry applicants who are conditionally approved can complete their interviews, the last step of the Global Entry process, while they are clearing through United States Customs and Border Protection or Preclearance. This options is now available at George Bush Intercontinental Airport (IAH) in Houston, Vancouver International Airport (YVR), William P. Hobby Airport (HOU), or Austin-Bergstrom International Airport (AUS). The program will expand to additional airports this summer, to include San Francisco International Airport.
What do I do when I land in the international terminal? Follow the signage directing you to CBP officers who can complete your Global Entry interview during your admissibility inspection. You won’t need any additional documents other than the requisite documents for international travel (e.g., your passport). After completing the process, you will be directed to a short feedback survey to help us improve this new opportunity for Global Entry applicants to Enroll on Arrival from an international trip. If you have a connecting flight, keep in mind that the Enroll on Arrival interview will take a few minutes longer than the typical CBP processing.
If you would like to save time and effort, then join thousands of other Global Entry applicants who are conditionally approved and participate in Enrollment on Arrival.
Travelers using the Enrollment on Arrival program will be interviewed by an officer for entry to the USA and also for Global Entry approval in the same transaction. Once admitted that traveler will also be a Global Entry Member.
So for the folks in India, if you apply for Global Entry while in India and clear the passport verification, then the Global Entry program just got a lot more convenient for you since you can avail of it on your next entry to the country, assuming you enter through one of the above airport.
Folks in the US….well its still mostly useless for us.